:root {
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #D97706;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-muted: #475569;
  --color-border: #CBD5E1;
  --radius: 14px;
  --space: 1rem;
  --maxw: 72rem;
  --shadow: 0 10px 30px rgba(11,18,32,0.08);
  --font-primary: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono, monospace;
  --scale: 1.125;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--space);
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

h1 {
  font-size: calc(1rem * var(--scale) * var(--scale) * var(--scale) * var(--scale));
  margin-block-end: calc(var(--space) * 1.5);
}

h2 {
  font-size: calc(1rem * var(--scale) * var(--scale) * var(--scale));
  margin-block-start: calc(var(--space) * 2.5);
  margin-block-end: var(--space);
  padding-block-end: calc(var(--space) * 0.5);
  border-block-end: 2px solid var(--color-border);
}

h3 {
  font-size: calc(1rem * var(--scale) * var(--scale));
  margin-block-start: calc(var(--space) * 1.5);
  margin-block-end: calc(var(--space) * 0.75);
}

p {
  margin-block-end: var(--space);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-secondary);
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Site Header */
.site-header {
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
  padding-block: var(--space);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
}

.site-name {
  font-size: calc(1rem * var(--scale) * var(--scale));
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-name:hover {
  color: var(--color-secondary);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.5);
  list-style: none;
}

.nav-list a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding-block: calc(var(--space) * 0.25);
  position: relative;
  transition: color 0.2s ease;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.nav-list a:hover {
  color: var(--color-primary);
}

.nav-list a:hover::after {
  transform: scaleX(1);
}

.nav-list a[aria-current="page"] {
  color: var(--color-primary);
}

.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--color-primary);
}

/* Main Content */
main {
  padding-block: calc(var(--space) * 2);
}

article {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-header {
  margin-block-end: calc(var(--space) * 2);
  padding-block-end: calc(var(--space) * 1.5);
  border-block-end: 3px solid var(--color-primary);
}

/* Breadcrumbs */
.breadcrumbs {
  margin-block-end: calc(var(--space) * 1.5);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 0.5);
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-inline-start: calc(var(--space) * 0.5);
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-muted);
}

.breadcrumbs a:hover {
  color: var(--color-primary);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

/* Sections */
section,
aside {
  margin-block-start: calc(var(--space) * 2);
}

aside {
  background-color: var(--color-bg);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-secondary);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-block: calc(var(--space) * 1.5);
  font-size: 0.9375rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(11,18,32,0.05);
}

caption {
  padding: var(--space);
  font-weight: 600;
  text-align: left;
  background-color: var(--color-primary);
  color: var(--color-surface);
}

thead {
  background-color: var(--color-bg);
}

th {
  font-weight: 600;
  text-align: left;
  padding: calc(var(--space) * 0.75) var(--space);
  border-block-end: 2px solid var(--color-border);
  color: var(--color-text);
}

td {
  padding: calc(var(--space) * 0.75) var(--space);
  border-block-end: 1px solid var(--color-border);
  vertical-align: top;
}

tbody tr:last-child td {
  border-block-end: none;
}

@media (hover: hover) {
  tbody tr {
    transition: background-color 0.15s ease;
  }
  tbody tr:hover {
    background-color: var(--color-bg);
  }
}

@media (min-width: 1024px) {
  thead th {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    z-index: 10;
  }
}

/* Responsive table wrapper */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Details/Summary Accordion */
details {
  margin-block-end: var(--space);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

details:hover {
  box-shadow: var(--shadow);
}

details[open] {
  box-shadow: var(--shadow);
}

summary {
  padding: var(--space) calc(var(--space) * 1.25);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
  background-color: var(--color-bg);
  transition: background-color 0.2s ease, color 0.2s ease;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  content: '−';
}

summary:hover {
  background-color: var(--color-border);
  color: var(--color-primary);
}

summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: -3px;
}

.details-content {
  padding: calc(var(--space) * 1.25);
  border-block-start: 1px solid var(--color-border);
}

.details-content p:last-child {
  margin-block-end: 0;
}

/* Blockquotes */
blockquote {
  margin-block: calc(var(--space) * 1.5);
  padding: calc(var(--space) * 1.25);
  padding-inline-start: calc(var(--space) * 1.5);
  background-color: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-muted);
}

blockquote p {
  margin-block-end: 0;
}

/* Footer */
.site-footer {
  background-color: var(--color-text);
  color: var(--color-bg);
  padding-block: calc(var(--space) * 2);
  margin-block-start: calc(var(--space) * 3);
}

.site-footer p {
  margin-block-end: 0;
  text-align: center;
  font-size: 0.875rem;
}

/* Grid Layout for larger screens */
@media (min-width: 768px) {
  :root {
    --space: 1.25rem;
  }
  
  h1 {
    font-size: calc(1rem * var(--scale) * var(--scale) * var(--scale) * var(--scale) * var(--scale));
  }
  
  h2 {
    font-size: calc(1rem * var(--scale) * var(--scale) * var(--scale) * var(--scale));
  }
  
  article {
    padding: calc(var(--space) * 2.5);
  }
}

@media (min-width: 1024px) {
  :root {
    --space: 1.5rem;
  }
  
  body {
    font-size: 1.0625rem;
  }
  
  .container {
    padding-inline: calc(var(--space) * 2);
  }
  
  article {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: calc(var(--space) * 2);
  }
  
  article > * {
    grid-column: 1 / -1;
  }
  
  article > section {
    grid-column: 1 / 9;
  }
  
  article > aside {
    grid-column: 9 / -1;
  }
  
  .page-header,
  .breadcrumbs,
  #faq-accordion,
  #intake-table,
  #comparison-table,
  #site-table,
  #standards-table {
    grid-column: 1 / -1;
  }
  
  main {
    padding-block: calc(var(--space) * 3);
  }
}

/* Utility for external links */
a[rel*="noopener"]::after {
  content: ' ↗';
  font-size: 0.75em;
  vertical-align: super;
}

/* Print styles */
@media print {
  .site-header,
  .site-footer {
    display: none;
  }
  
  article {
    box-shadow: none;
    padding: 0;
  }
  
  a {
    color: var(--color-text);
  }
  
  a[href]::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: var(--color-muted);
  }
}